这几题怎么巧算?
4个回答
2018-02-05 · 知道合伙人教育行家
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35/36×29
=(1-1/36)×29
=1×29-1/36×29
=29-29/36
=28又7/36
49又1/11×1/6
=(48+1又1/11)
=48×1/6+12/11×1/6
=8+2/11
=8又2/11
4/33×133
=4/33×(132+1)
=4/33×132+4/33×1
=16+4/33
=16又4/33
126又1/15÷31
=(124+2又1/15)×1/31
=124×1/31+31/15×1/31
=4+1/15
=4又1/15
=(1-1/36)×29
=1×29-1/36×29
=29-29/36
=28又7/36
49又1/11×1/6
=(48+1又1/11)
=48×1/6+12/11×1/6
=8+2/11
=8又2/11
4/33×133
=4/33×(132+1)
=4/33×132+4/33×1
=16+4/33
=16又4/33
126又1/15÷31
=(124+2又1/15)×1/31
=124×1/31+31/15×1/31
=4+1/15
=4又1/15
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